When we use the term “hip joint,” most people are actually referring to more than one joint. The true hip joint is a ball-and-socket joint where the head (ball) of the thigh bone (femur) meets the acetabulum (socket) of the hip. Another is the sacroiliac joint, formed where the sacrum meets the ilium. All of these joints are part of the pelvic structure and therefore biomechanically influence one another. The true hip joint can commonly be affected by wear and tear arthritis (degenerative arthritis) which is characterized by a wearing away of the cartilage in the joint. As the protective cartilage is worn away, bare bone is exposed within the joint leading to stiffness, pain and sometimes hip replacement surgery. The sacroiliac joints are also prone to arthritis as well as subluxation, and are a common cause of low back pain.
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Berg G, et al., Low Back Pain during pregnancy. Obstetrics Gynecology, 1988, 71, pp.71-75. Barbor R, Back Pain. British Medical Journal, 1978,ii, p. 566. Hooper, PD, Faye, LJ, The hips as an overlooked cause of low back pain: A case report. Chiropractic technique, 1994,6(1).